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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03223251e73e50974f9ab966c143dde35982ba2b7aed656a8f6bb807fafe27b' 
  AND token = '0BH9/Thc9EA+6Cx+yeIrXyl0m4xh+AiInOLD/NqHAB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}